摘要
采用病害流行学常规方法研究古巴假霜霉菌(Pseudoperonospora cubensis)在黄瓜中流行的规律,结果表明:病害显症总共需要5d,显症后的前3d可出现90%的病斑,显症的最后2d出现的病斑仅为10%;黄瓜的叶位与抗侵染力显著负相关(P≤0.05),叶位越低,抗侵染能力越弱,随着叶位的提高,叶片的抗侵染力也明显提高;黄瓜不同叶位上的病斑产生游动孢子囊的数量不同,叶位越低,病斑产生游动孢子囊的数量越多,随着叶位的提高,病斑产生游动孢子囊的数量明显减少。病菌游动孢子囊飞散的数量随着高度的增加,数量不断减少。病斑空间分布型为聚集分布。
Conventional epidemic methods were applied to the study of the epidemic trend of Pseudoperonospora cubensis in cucumbers. Result showed that the period of symptomatic appearance of the disease was about 5 days. And 90 percent of lesions appeared in the first three days and 10 percent of lesions in the last two days. A significant negative correlation was found between the disease resistance capacity of cucumbers infected by P. cubensis and the elevation of the leaf position（P≤0.05）. The new leaves have higher resistance capacity against P. cubensis infection than the older leaves. The number of zoosporangia was different in different leaf positions of cucumbers. Older leaves exhibit higher zoosporangia production capacity than the new leaves. The number of scattered zoosporangia decreases with the height. The spatial distribution pattern of P. cubensis is aggregated.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2010年第4期107-109,共3页
Journal of Northeast Forestry University
基金
国家自然科学基金资助项目(30600003)
关键词
黄瓜
古巴假霜霉菌
流行规律
孢子囊飞散
空间分布型
霜霉病
Cucumbers
Pseudoperonospora cubensis
Epidemic trends
Sporangium dispersal
Spatial distribution
Downy mildew
